SouthWire #10 TelcoFlex Gray L3 Class B, Cloth Braid.
Southwire’s TelcoFlex® lll cable is single conductor with a class B stranded tinned copper conforming to ASTM B-33 and Underwriters’ laboratories requirements. An opaque mylar tape shall be applied over the conductor to facilitate stripping. Insulation is 90°C rated low smoke, non-halogen, TelcoHyde™ 5221 conforming to Underwriters' Laboratories standard 44 and Telcordia Specification GR-347-CORE, also UL and CSA 105°C AWM rated. The insulation has a limiting oxygen index of 35%.